What happens

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What happens when I call 9-1-1
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The three-digit telephone number "9-1-1" has been
designated as the "Universal Emergency Number."
It is intended as a nationwide telephone number
and gives the public fast and easy access to a
Public Safety Answering Point (PSAP).
2010
1950
1960
1970
1980
1990
2000
1957, National Association of Fire Chiefs
recommended use of a single number for reporting
fires.
In the early 1970s, ATT develops "selective call
routing."
1998, Seattle, Qwest delivers the first Enhance
Wireless 9-1-1
2005, VoIP E9-1-1
February 16, 1968, Senator Rankin Fite completed
the first 9-1-1 call made in the United States in
Haleyville, Alabama.
1987, 50 of the US population had access to 9-1-1
2003, 96 of the geographic US is covered by some
type of 9-1-1.
30 years after the introduction of Enhanced
9-1-1, the service remains essentially unchanged.
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Who am I?
Emma McNutt
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E9-1-1 is dependent on 3 key databases MSAG,
SRDB, ALI
MSAG Master Street Address Guide
The first phase of creating an E9-1-1 system is
the development of the MSAG. This process starts
with the community identifying the jurisdictional
or emergency responder boundaries. Each unique
combination of Law Enforcement, Fire Protection
and Medical Response is identified establishes an
Emergency Service Zone (ESZ). Each zone is
identified by an Emergency Service Number (ESN).
Once established every thoroughfare is listed
with the specific house number ranges that reside
within the zone. Each customer record will pass
the MSAG and an ESN will be added to the customer
record to identify which jurisdiction would
respond in the event of a 9-1-1 call
763
763
AREA
AREA
CODE
CODE
153
651
651
AREA
AREA
327
CODE
CODE
325
952
952
215
AREA
AREA
CODE
CODE
421
North
North
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MSAG Master Street Address Guide
Zone 2 ESN002
Zone 3 ESN003
SO
PD
FD1
FD1
EMS2
PD FD1 EMS2
EMS1
Zone 1 ESN001
Main St
0 50 51 725 726 741742 953 954 1201
Zone 6 ESN006
PD FD2
SO FD2 EMS2
SO FD2
EMS1
EMS1
Zone 5 ESN005
Zone 4 ESN004
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MSAG Master Street Address Guide
Customer Information
612 555 1239 Jim Carroll 989 Main St Eagan, MN
SRDB Selective Routing Data Base
ALI Automatic Location Identification
612 555 1239 ESN 421 Jim Carroll 989 Main
St Eagan, MN Eagan PD West Metro Fire North
Memorial EMS
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Wireline Infrastructure
Voice ANI
Voice ANI
CO
End Office
Selective Router
ALI Automatic Location Identification
ANI
Data Base
Data
Voice
ALI
PSAP (Public Safety Answering Point)
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Wireless Infrastructure
Voice ANI
Voice ANI
MSC
End Office
Selective Router
ALI Automatic Location Identification
ANI
ALI
Data Base
Data
Voice
ALI
PDE Position Determination Entity
SCP Service Control Point
PSAP (Public Safety Answering Point)
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VoIP Infrastructure
Voice ANI
Voice ANI
MSC
End Office
Selective Router
VoIP GW
ALI Automatic Location Identification
ANI
ALI
Data Base
Data
Voice
ALI
PSAP (Public Safety Answering Point)
MPC/VPC Mobile/VoIP Positioning Center